Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992aipc..254..595h&link_type=abstract
In: Testing the AGN paradigm; Proceedings of the 2nd Annual Topical Astrophysics Conference, Univ. of Maryland, College Park, Oc
Astronomy and Astrophysics
Astronomy
10
Active Galactic Nuclei, Black Holes (Astronomy), Gravitational Effects, Interstellar Gas, Radio Galaxies, Red Shift, Angular Momentum, Radio Sources (Astronomy), Seyfert Galaxies, Spectral Line Width
Scientific paper
Evidence regarding the popular notion that the AGN fuel source is located outside the nucleus (at radii where the gravitational force of the central engine is small compared to that of the host galaxy) is reviewed. Nonkinematic evidence for an extranuclear fuel source, including the possible connection between cooling flows and radio emission in giant ellipticals, the presence of large central molecular gas concentrations in some Seyfert galaxies, and the preference of Seyfert nuclei for ovally distorted host galaxies is also examined. Evidence for a link between the AGN phenomenon and galaxy interactions is briefly summarized. It is argued that this relationship provides indirect but highly suggestive evidence that the extranuclear environment plays a major role in fueling AGN.
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